Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 26, NWS New York, NY

August 22, 2021Richmond County, New York; Union County, New Jersey

NWS New York, NY issued this flash flood warning at Aug 22, 2021, 1:22 AM EDT for Richmond County, New York; Union County, New Jersey. It was in force for 117 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 22, 2021, 1:22 AM EDT (05:22 UTC)
Expired: Aug 22, 2021, 3:19 AM EDT
In force: 117 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Union County, NJ, Richmond County, NY

The radar

The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 05:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 22, 1:59 AM EDT	FLASH FLOOD	Grasmere, NY	ST. JOHNS AVE FLOODED. WATER UP TO HOOD OF CAR.
Aug 22, 2:18 AM EDT	FLASH FLOOD	1 W Elizabeth, NJ	ALL LANES CLOSED DUE TO FLOODING AT US 1 & 9 NORTHBOUND NORTH OF GRAND STREET.
Aug 22, 2:31 AM EDT	FLASH FLOOD	1 W Elizabeth, NJ	ALL LANES CLOSED DUE TO FLOODING AT US 1 & 9 SOUTHBOUND NORTH OF GRAND STREET.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 5.4 hours before the alert went out and 121 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1163 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

552 
WGUS51 KOKX 220522
FFWOKX
NJC039-NYC085-220830-
/O.NEW.KOKX.FF.W.0026.210822T0522Z-210822T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
122 AM EDT Sun Aug 22 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Union County in northeastern New Jersey...
  Richmond (Staten Island) County in southeastern New York...

* Until 430 AM EDT.

* At 122 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Elizabeth, Plainfield, Linden, Summit, Todt Hill, Huguenot, The 
  Verrazano Narrows Bridge, Port Richmond, Tottenville, Clark, 
  Union, Oakwood, Tompkinsville, Annadale, Westfield, Rahway, Scotch 
  Plains, Cranford, New Dorp and Hillside.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4050 7426 4055 7425 4056 7422 4060 7421
      4060 7446 4062 7443 4066 7440 4066 7445
      4067 7446 4074 7437 4067 7414 4064 7416
      4066 7409 4065 7406 4060 7404 4052 7414
      4049 7426 4050 7428

FLASH FLOOD...RADAR INDICATED

$$

MW

1 follow-up statement

618 
WGUS71 KOKX 220719
FFSOKX

Flash Flood Statement
National Weather Service New York NY
319 AM EDT Sun Aug 22 2021

NJC039-NYC085-220729-
/O.CAN.KOKX.FF.W.0026.000000T0000Z-210822T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Union NJ-Richmond (Staten Island) NY-
319 AM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING IS CANCELLED FOR UNION AND RICHMOND (STATEN 
ISLAND) COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 800 PM EDT Monday for portions 
of southern Connecticut, northeast New Jersey and southeast New York.

LAT...LON 4050 7426 4055 7425 4056 7422 4060 7421
      4060 7446 4062 7443 4066 7440 4066 7445
      4067 7446 4074 7437 4067 7414 4064 7416
      4066 7409 4065 7406 4060 7404 4052 7414
      4049 7426 4050 7428

$$

MW

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 8:46 PM EDT	Flash Flood Warning	OKX	Kings, Queens	5 hr
Aug 21, 9:03 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	87 min
Aug 21, 10:18 PM EDT	Flash Flood Warning	OKX	New York	4 hr
Aug 21, 10:37 PM EDT	Areal Flood Advisory	OKX	Bronx, Nassau, New York, Queens, Westchester	83 min
Aug 21, 10:47 PM EDT	Flash Flood Warning	OKX	Bronx, Nassau, New York, Queens	103 min
Aug 22, 2:49 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens	86 min
Aug 22, 8:39 AM EDT	Areal Flood Advisory	OKX	Suffolk	4 hr
Aug 22, 1:32 PM EDT	Areal Flood Advisory	OKX	Kings, Nassau, Queens	118 min
Aug 22, 2:44 PM EDT	Flash Flood Warning	OKX	Bronx, Kings, New York, Queens, Richmond, Rockland and 1 more	3 hr
Aug 22, 3:17 PM EDT	Flash Flood Warning	OKX	Kings, Nassau, Queens	2 hr
Aug 22, 4:32 PM EDT	Coastal Flood Statement	OKX	Nassau, Queens, Suffolk, Westchester	10 hr
Aug 22, 4:51 PM EDT	Flash Flood Warning Considerable damage threat	OKX	Bronx, New York, Orange, Rockland, Westchester	6 hr
Aug 22, 5:17 PM EDT	Small Craft Advisory	OKX		42 hr
Aug 22, 12:18 AM EDT	Flash Flood Warning	OKX	Essex, Passaic	2 hr
Aug 22, 4:11 AM EDT	River Flood Warning	OKX	Bergen	34 hr

Nearby

Flash Flood Warnings in New York, 2021 Flash Flood Warnings in New Jersey, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.